#include <stdio.h>

#define SIZE 3
// linear-search: 线性查找
int arr_find(int a[], int n, int x) {
        // Please fill this blank
        for (int i = 0; i < n; i++) {
                if (a[i] == x) {
                        return i;
                }
        }
        return -1;
}

int main()
{
        int n, key;
        int a[SIZE] = {1, 3, 6};
        scanf("%d", &n);
        for (int i = 0; i < SIZE; i++) {
                scanf("%d", a + i);
        }
        scanf("%d", &key);
        int tmp = arr_find(a, SIZE, key);
        if (tmp != -1) {
                printf("POS: %d\n", tmp+1);
        } else {
                printf("NO FOUND!\n");
        }
        return 0;
}
